Power definition? - Audio & Electronics Forum

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Power definition?
Thursday, January 26, 2006 7:58 PM
Ok, i know what RMS power is, and max power, duh!

But im looking for a new amp for my New car, and some of the amps only have Dynamic power ratings.

Whats dynamic power?

And how does it differ from RMS?




Re: Power definition?
Thursday, January 26, 2006 8:07 PM
i believe dynamic is the same as max power. is it an mtx amp
Re: Power definition?
Thursday, January 26, 2006 8:17 PM
i dont recall.



Re: Power definition?
Thursday, January 26, 2006 8:28 PM
Just im need an amp for (2) 250watt RMS subs, 1000 watt peak each.



Re: Power definition?
Thursday, January 26, 2006 8:57 PM
i thought dynamic was rms?

wysiwyg wrote:i would say they bang, they don't really pound so much. but if
you want to bump, then they will bump and hit real hard and a lot good.

LOL
Re: Power definition?
Thursday, January 26, 2006 10:17 PM
Dynamic power is the RMS power the amp puts out with the vehicle running (ie: at 14.4V rather than 12V). Alot of companies (many considered rather high-end and bragged about often in this forum) rate their gear at 14.4V to make more money from their products. I personally hate that companies do this, as 14.4V is a very-best-case-scenario when it comes to car audio, especially in vehicles with stock electrical systems.





The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.
Re: Power definition?
Friday, January 27, 2006 9:04 AM
ok i was backwards good looking out
Re: Power definition?
Friday, January 27, 2006 11:41 AM
if the amps also have MAX power stamped on them here is how to easily convert.

RMS = MAX POWER *.707

if you multiply the MAX Power rating by .707, you will be given your RMS power.

do a little further research, everything should be labeled in MAX power is someform of another.

to calculat MAX power if DYNAMIC POWER really is 14,4V....


take the dynamic, lets say 144 Watts for example

dived 144WATTS by 14.4 V

144W / 14.4V = 10AMPS

now that you have the amount of current the AMP draws, times that by 12V for a normal DC car battery.

10A * 12V = 120WATTS

120Watts is what the AMP's MAX power will be at 12V


to calculate RMS.... multiply by .707

120W * .707 = 84.84W

so the RMS power of the AMP is just under 85Watts

any question on stuff like this, lemme know. im an electrical engineering student






Injection is nice but id rather be BLOWN!
Re: Power definition?
Friday, January 27, 2006 4:07 PM
Smart ass, electrical guys. My room mate is one one of you guys. I'm actually a mech guy, but nice post. Makes sense.
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